US7220042B2 - Light guide plate structure of backlight module - Google Patents

Light guide plate structure of backlight module Download PDF

Info

Publication number
US7220042B2
US7220042B2 US11/074,650 US7465005A US7220042B2 US 7220042 B2 US7220042 B2 US 7220042B2 US 7465005 A US7465005 A US 7465005A US 7220042 B2 US7220042 B2 US 7220042B2
Authority
US
United States
Prior art keywords
light
guide plate
light guide
backlight module
light source
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related, expires
Application number
US11/074,650
Other versions
US20060203518A1 (en
Inventor
Wen-Pao Tseng
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
K Bridge Electronics Co Ltd
Original Assignee
K Bridge Electronics Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by K Bridge Electronics Co Ltd filed Critical K Bridge Electronics Co Ltd
Priority to US11/074,650 priority Critical patent/US7220042B2/en
Assigned to K-BRIDGE ELECTRONICS CO., LTD. reassignment K-BRIDGE ELECTRONICS CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: TSENG, WEN-PAO
Publication of US20060203518A1 publication Critical patent/US20060203518A1/en
Application granted granted Critical
Publication of US7220042B2 publication Critical patent/US7220042B2/en
Expired - Fee Related legal-status Critical Current
Adjusted expiration legal-status Critical

Links

Images

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0016—Grooves, prisms, gratings, scattering particles or rough surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0038—Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
    • G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources

Definitions

  • the present invention relates to an improved light guide plate structure of a backlight module, and more particularly to a light guide plate structure of backlight module capable of preventing the formation of bright and dark bands.
  • FIG. 1 a cross-sectional view of a conventional backlight module structure for a liquid crystal display is shown.
  • the structure of the whole backlight module comprises a light guide plate 20 disposed at the bottom surface of a liquid crystal display panel 10 , an optical film 30 formed by a prism or diffuser and installed at an emergent plane of the light guide plate 20 , a reflective panel 40 installed at a reflective plane of the light guide plate 20 , and a light source 50 installed on a side.
  • the design of the optical film 30 made of a prism or a diffuser is altered to improve the light performance including luminance and evenness.
  • the whole light guide plate produces a light path which is different from the traditional light path to the light of the light source.
  • the Mach band issue (having a dark band and a bright band) of the prior art liquid crystal module can be overcome effectively, and thus the light of the light source can be distributed more effectively.
  • FIG. 1 is a schematic view of the structure of a conventional backlight module
  • FIG. 2 is a schematic view of the structure of a backlight module of the present invention.
  • FIG. 3 is another schematic view of the structure of a backlight module of the present invention.
  • FIG. 4 is another further schematic view of the structure of a backlight module of the present invention.
  • FIG. 5 is a schematic view of a light path of a backlight module of the present invention.
  • FIG. 6 is an exploded view of a backlight module according to another preferred embodiment of the present invention.
  • FIG. 2 a light guide plate structure of the present invention is illustrated.
  • the basic structure of a whole backlight module as shown in FIGS. 2 and 3 also comprises a light guide plate 20 disposed at the bottom surface of a liquid crystal display panel 10 , an optical film 30 formed by a prism or diffuser and installed at an emergent plane of the light guide plate 20 , a reflective panel 40 installed at a reflective plane of the light guide plate 20 , and a light source 50 installed on a side.
  • the light guide plate 20 If a light emitted from the light source 50 is projected to the light guide plate 20 , the light will be guided and projected upward by the refraction and reflection of the light guide plate 20 and the reflective panel 40 and passed through the optical film 30 made of a prism or a diffuser to produce evener light emergent from the liquid crystal display panel 10 .
  • the light guide plate 20 forms more than one hollow layer 23 within an incident side A to an effective light emitting area B, and the hollow layers 23 could be continuous (as shown in FIG. 4 ) or discontinuous (as shown in FIG. 3 ) and of various geometric shapes, wherein the hollow layers 23 are installed at the corresponding positions of the light sources 50 , so that a light of the light source 50 changes its light path when passing through the hollow layers 23 as shown in FIG. 5 to effectively distribute and evenly emit the light.
  • the light guide plate 20 can have a pattern 22 with a light reflection function on a reflective plane 21 or an emergent plane 24 , and the pattern 22 could be in a form of various geometric shapes to improve the light performance including luminance and evenness.
  • the light guide plate 20 further comprises an incident plane 24 at a corner section, and the incident plane 24 is a shape with an indented corner.
  • the light source 50 is installed at the corner section, and the light enters into the light guide plate 20 through the incident plane 24 .
  • a reflective panel 40 is installed under the light guide plate 20 , and the hollow layer 23 is disposed at a position corresponding to the light source 50 .
  • the hollow layer 23 changes the light path of the light of the light source 50 so as to effectively overcome the issue of having bright and dark bands according to the prior art liquid crystal modules by more active and positive measures and distribute the light of the light source more effectively.

Abstract

A backlight module installs a light guide plate, a plurality of optical films, and a liquid crystal display panel in order on an emergent plane of a light source, wherein the light guide plate forms more than one hollow layer within an incident side to an effective light emitting area, such that the hollow layer of the light guide plate changes the light path of the light of the light source to effectively distribute and evenly emit the light towards each optical film. As a result, the dark band in each light source can be eliminated, the issue of having dark and bright bands according to the prior arts can be overcome effectively, and the light performance including luminance and evenness can be enhanced.

Description

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an improved light guide plate structure of a backlight module, and more particularly to a light guide plate structure of backlight module capable of preventing the formation of bright and dark bands.
2. Description of the Related Art
Referring to FIG. 1, a cross-sectional view of a conventional backlight module structure for a liquid crystal display is shown. The structure of the whole backlight module comprises a light guide plate 20 disposed at the bottom surface of a liquid crystal display panel 10, an optical film 30 formed by a prism or diffuser and installed at an emergent plane of the light guide plate 20, a reflective panel 40 installed at a reflective plane of the light guide plate 20, and a light source 50 installed on a side. If a light emitted from the light source 50 is projected to the light guide plate 20, the light will be guided and projected upward by the refraction and reflection of the light guide plate 20 and the reflective panel 40, and then the light will pass through the optical film 30 made of a prism or a diffuser to produce evener light emergent from the liquid crystal display panel 10. Since the requirements for the emergent light performance get higher, related manufacturers usually build a pattern 22 with a light reflective function on a reflective plane 21 of the light guide plate 20, and the shape of the pattern 22 could be circular, rectangular or linear. After a light source is reflected by the pattern 22, the light source is guided and emitted successfully to enhance the light performance. Alternatively, the design of the optical film 30 made of a prism or a diffuser is altered to improve the light performance including luminance and evenness.
SUMMARY OF THE INVENTION
It is a primary objective of the present invention to provide a light guide plate structure of a backlight module, which forms at least one hollow layer within an incident side to an effective light emitting area in a panel of the light guide plate, such that the light of a light source changes its path by the hollow layer in the light guide plate to effectively distribute and evenly emit the light.
In other words, the whole light guide plate produces a light path which is different from the traditional light path to the light of the light source. With more active and positive measures, the Mach band issue (having a dark band and a bright band) of the prior art liquid crystal module can be overcome effectively, and thus the light of the light source can be distributed more effectively.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic view of the structure of a conventional backlight module;
FIG. 2 is a schematic view of the structure of a backlight module of the present invention;
FIG. 3 is another schematic view of the structure of a backlight module of the present invention;
FIG. 4 is another further schematic view of the structure of a backlight module of the present invention;
FIG. 5 is a schematic view of a light path of a backlight module of the present invention; and
FIG. 6 is an exploded view of a backlight module according to another preferred embodiment of the present invention.
 DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring to FIG. 2, a light guide plate structure of the present invention is illustrated. The basic structure of a whole backlight module as shown in FIGS. 2 and 3 also comprises a light guide plate 20 disposed at the bottom surface of a liquid crystal display panel 10, an optical film 30 formed by a prism or diffuser and installed at an emergent plane of the light guide plate 20, a reflective panel 40 installed at a reflective plane of the light guide plate 20, and a light source 50 installed on a side. If a light emitted from the light source 50 is projected to the light guide plate 20, the light will be guided and projected upward by the refraction and reflection of the light guide plate 20 and the reflective panel 40 and passed through the optical film 30 made of a prism or a diffuser to produce evener light emergent from the liquid crystal display panel 10.
The technical characteristics of the present invention reside on that the light guide plate 20 forms more than one hollow layer 23 within an incident side A to an effective light emitting area B, and the hollow layers 23 could be continuous (as shown in FIG. 4) or discontinuous (as shown in FIG. 3) and of various geometric shapes, wherein the hollow layers 23 are installed at the corresponding positions of the light sources 50, so that a light of the light source 50 changes its light path when passing through the hollow layers 23 as shown in FIG. 5 to effectively distribute and evenly emit the light. Of course, the light guide plate 20 can have a pattern 22 with a light reflection function on a reflective plane 21 or an emergent plane 24, and the pattern 22 could be in a form of various geometric shapes to improve the light performance including luminance and evenness.
Referring to FIG. 6, the structure of a backlight module is shown. The light guide plate 20 further comprises an incident plane 24 at a corner section, and the incident plane 24 is a shape with an indented corner. The light source 50 is installed at the corner section, and the light enters into the light guide plate 20 through the incident plane 24. A reflective panel 40 is installed under the light guide plate 20, and the hollow layer 23 is disposed at a position corresponding to the light source 50. Similarly, the hollow layer 23 changes the light path of the light of the light source 50 so as to effectively overcome the issue of having bright and dark bands according to the prior art liquid crystal modules by more active and positive measures and distribute the light of the light source more effectively.
In summation of the above description, the present invention herein provides a feasible light guide plate structure and complies with the patent application requirements, and thus is submitted for patent application. However, the description and its accompanied drawings are used for describing preferred embodiments of the present invention, and it is to be understood that the invention is not limited thereto. To the contrary, it is intended to cover various modifications and similar arrangements and procedures, and the scope of the appended claims therefore should be accorded the broadest interpretation so as to encompass all such modifications and similar arrangements and procedures.

Claims (3)

1. A light guide plate structure of a backlight module, comprising: a light guide plate, a plurality of optical films, and a liquid crystal display panel in order on an emergent plane of a light source, wherein said light guide plate forms more than one hollow pattern disposed within an incident side to an effective light emitting area, thereby said hollow pattern of said light guide plate changes a light path of said light of said light source to effectively distribute and evenly emit said light, wherein said light guide plate forms a pattern with a light reflection function on a reflective plane or an emergent plane, and said pattern is in a form of various geometric shapes.
2. The light guide plate structure of backlight module of claim 1, wherein said light source is installed on a side of said light guide plate and a reflective panel is installed under said light guide plate.
3. The light guide plate structure of backlight module of claim 1, wherein said light guide plate has an incident plane at a corner section of said light guide plate, and said incident plane is in a shape having a truncated corner, and said light source is installed at said corner section, such that said light enters said light guide plate from said incident plane, and a reflective panel is installed under said light guide plate.
US11/074,650 2005-03-09 2005-03-09 Light guide plate structure of backlight module Expired - Fee Related US7220042B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US11/074,650 US7220042B2 (en) 2005-03-09 2005-03-09 Light guide plate structure of backlight module

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US11/074,650 US7220042B2 (en) 2005-03-09 2005-03-09 Light guide plate structure of backlight module

Publications (2)

Publication Number Publication Date
US20060203518A1 US20060203518A1 (en) 2006-09-14
US7220042B2 true US7220042B2 (en) 2007-05-22

Family

ID=36970671

Family Applications (1)

Application Number Title Priority Date Filing Date
US11/074,650 Expired - Fee Related US7220042B2 (en) 2005-03-09 2005-03-09 Light guide plate structure of backlight module

Country Status (1)

Country Link
US (1) US7220042B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070058396A1 (en) * 2005-09-09 2007-03-15 Innolux Display Corp. Backlight module with light guide protrusion and liquid crystal display with same
US8911132B1 (en) * 2013-03-15 2014-12-16 Cooper Technologies Company Edgelit optic entrance features

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100582831C (en) * 2006-12-22 2010-01-20 鸿富锦精密工业（深圳）有限公司 Light conducting plate and back light module unit
WO2008080996A1 (en) 2006-12-29 2008-07-10 Oy Modines Ltd Incoupling structure for lighting applications
US20090088782A1 (en) * 2007-09-28 2009-04-02 Missoum Moumene Flexible Spinal Rod With Elastomeric Jacket
KR20140086754A (en) * 2012-12-28 2014-07-08 제일모직주식회사 Back light unit and optical display comprising the same

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20010046006A1 (en) * 1998-09-22 2001-11-29 Yoji Oki Light guide device enhancing a polarized component and liquid crystal display device
US20020064037A1 (en) * 2000-11-25 2002-05-30 Lee Pyung Yong Backlight unit of bi-directional irradiation for liquid crystal display device
US20040012945A1 (en) * 2000-12-14 2004-01-22 Mitsubishi Rayon Co., Ltd. Planar light source system and light deflecting device therefor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20010046006A1 (en) * 1998-09-22 2001-11-29 Yoji Oki Light guide device enhancing a polarized component and liquid crystal display device
US20020064037A1 (en) * 2000-11-25 2002-05-30 Lee Pyung Yong Backlight unit of bi-directional irradiation for liquid crystal display device
US20040012945A1 (en) * 2000-12-14 2004-01-22 Mitsubishi Rayon Co., Ltd. Planar light source system and light deflecting device therefor

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070058396A1 (en) * 2005-09-09 2007-03-15 Innolux Display Corp. Backlight module with light guide protrusion and liquid crystal display with same
US7401965B2 (en) * 2005-09-09 2008-07-22 Innocom Technology (Shenzhen) Co., Ltd. Backlight module with light guide protrusion and liquid crystal display with same
US8911132B1 (en) * 2013-03-15 2014-12-16 Cooper Technologies Company Edgelit optic entrance features

Also Published As

Publication number Publication date
US20060203518A1 (en) 2006-09-14

Similar Documents

Publication Publication Date Title
US20060203511A1 (en) Incident assembly of light guide plate
US7665876B2 (en) Backlight unit
US10302837B2 (en) Backlight unit and liquid crystal display including the same
KR102236711B1 (en) Optical element and backlight unit including the same
JP5127851B2 (en) Planar illumination device and liquid crystal display device including the same
JP5664100B2 (en) Light emitting device and image display device
US7220042B2 (en) Light guide plate structure of backlight module
JP2010108795A (en) Illumination device, and display device
US20200159071A1 (en) Back light unit and display device having the same
US20180106961A1 (en) Backlight unit
KR20160051292A (en) lens,light emitting apparatus including the lens, and backlight unit including the apparatus
TWI501008B (en) Backlight module
US10107476B2 (en) Luminous flux control member, light emitting device, and display device
US20070133228A1 (en) Back light module
US10534126B2 (en) Lighting device and display device
US8405796B2 (en) Illumination device, surface light source device, and liquid crystal display device
US20060203514A1 (en) Light guide plate structure
US20130135843A1 (en) Light guide plate structure and backlight module using the same
JP2007256697A (en) Liquid crystal display
US20100135003A1 (en) Backlight Module and Liquid Crystal Display Module Using the Backlight Module
US20150002778A1 (en) Display device
JP2010102906A (en) Planar light source, and liquid crystal display device
KR20160059006A (en) Backlight unit and liquid crystal display device having the same
JP2009231012A (en) Back light unit
WO2013088594A1 (en) Backlight apparatus and liquid crystal display apparatus

Legal Events

Date Code Title Description
AS Assignment

Owner name: K-BRIDGE ELECTRONICS CO., LTD., TAIWAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:TSENG, WEN-PAO;REEL/FRAME:016372/0784

Effective date: 20050127

REMI Maintenance fee reminder mailed
LAPS Lapse for failure to pay maintenance fees
STCH Information on status: patent discontinuation

Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362

FP Lapsed due to failure to pay maintenance fee

Effective date: 20110522